Criticism and self-criticism are necessary __________they may help us to find...

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问题 Criticism and self-criticism are necessary __________they may help us to find out and correct our mistakes.

选项 A.by that? ?
B.at that
C.on that? ?
D.in that

答案D

解析考查原因状语从句。句意为“批评与自我批评是必要的. __________它们可以帮助我们发现并改正错误”。in that意思是“因为,由于”,用于引导原因状语从句,故选D。
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